干旱区地理2024，Vol.47Issue(12)：2017-2029,13.DOI:10.12118/j.issn.1000-6060.2024.210
塔里木河下游不同地下水埋深下胡杨水分利用来源研究
Water utilization sources of Populus euphratica under different groundwater depths in the lower Tarim River
摘要
Abstract
Groundwater and soil water are critical determinants of desert vegetation growth in arid zones,and the water utilization patterns of desert vegetation are integral to the ecohydrological processes in these regions.To en-hance the understanding of water utilization by desert vegetation,this study employed the hydrogen and oxygen stable isotope tracer technique,combined with MixSIAR,to investigate the water absorption sources of Populus euphratica across different forest ages and varying groundwater burial depths.The findings revealed the follow-ing:(1)Soil water δ18O and δD values decreased with increasing soil depth and increased with greater distance from the shore.Xylem water δ18O and δD values exhibited the highest variability in middle-aged trees,followed by old trees and young trees.Groundwater δ18O and δD values decreased with increasing distance from the shore.(2)The primary water source for Populus euphratica across different forest ages and groundwater burial depths was groundwater,followed by deep soil water.Populus euphratica located near the riverbank could directly uti-lize river water.When groundwater burial depths were 1.98-2.10 m,1.95-2.21 m,2.49-2.61 m,3.51-3.73 m,and 4.66-4.73 m,the proportion of groundwater utilization was highest in old trees,accounting for 18.4%,19.6%,17.8%,23.1%,and 21.9%,respectively.Middle-aged trees exhibited slightly lower utilization rates of 16.7%,17.6%,16.7%,21.4%,and 21.6%,while young trees showed the lowest utilization rates of 16.0%,16.6%,and 19.9% (no seedlings were observed in areas with groundwater burial depths of 2.49-2.61 m and 4.66-4.73 m).(3)Groundwater burial depth increased with distance from the riverbank,whereas soil water content and salinity decreased with distance from the riverbank and increased with soil depth.The proportion of water utilized by Populus euphratica increased with soil water content and salinity.Investigating the water utilization sources of Populus euphratica under varying groundwater burial depths provides theoretical support for the ecological resto-ration of desert riparian forests in the lower Tarim River,Xinjiang,China.关键词
氢氧稳定同位素/MixSIAR模型/水分来源/地下水埋深/胡杨/塔里木河下游Key words
hydrogen and oxygen stable isotopes/MixSIAR model/water source/groundwater burial depth/Populus euphratica/lower Tarim River引用本文复制引用
蒋晓晴,郝帅,叶茂,何定学,张子涵,李国华..塔里木河下游不同地下水埋深下胡杨水分利用来源研究[J].干旱区地理,2024,47(12):2017-2029,13.基金项目
新疆维吾尔自治区高校科研计划项目(XJEDU2022P065) （XJEDU2022P065）
新疆维吾尔自治区重点实验室招标课题(XJDX0909-2021-02) （XJDX0909-2021-02）
新疆维吾尔自治区自然科学基金项目(2021D01A118) （2021D01A118）
国家自然科学基金项目(42161004)资助 （42161004）
